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U AV - M I C R O P O R TA B L E A N A LY Z E R S | G L A 1 3 3 S E R I E S | U M/G L A 1 3 3 - E N R E V. B
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Features and Measurement
Theory
The analyzer is a cavity-based spectroscopy instrument . The
analyzer's cavity design enhances the absorption of laser
light by the target gas molecule . This enhancement improves
the signal-to-noise ratio over conventional laser sensors
enabling trace gas measurement and sensitive monitoring .
The type of gas the analyzer can measure is based upon the
laser wavelength used . ABB provides a variety of models,
each targeting gases that various industries monitor . All
measurements are real-time .
Connection Ports
This section describes the connections shown in Figure 4 .
Figure 4 Connection Ports
Gas Inlet
The gas to be measured is connected to the ¼ inch push-
connect INLET port .
During normal operation, the pump draws the sample through
the analyzer inlet and exhausts the sample through the
ventilation holes of the case . The acceptable inlet gas-pressure
range is 0 to 15 psig .
Power
The analyzer is powered 11-30 V DC to the DC power inlet
with a 5 A / 32 VDC automotive fuse inside the power-input
harness . Power can be supplied using the 120/240 V power
cable supplied with the analyzer or from the UAV batteries (if
applicable, refer to the HoverGuard™ Solution System Manual ,
document number 3KXG167006R4601).
Data Interface
• USB ports – used to transfer data to a USB memory device or
connect a USB keyboard and mouse .
• WiFi External Antenna port – allows for wireless connection to
the analyzer via an externally connected antenna . Note that the
external antenna, packaged with the analyzer, must be
attached prior to powering on the analyzer .
• COM/DC Out ports (15 pin Micro-D Connector) – real-time
digital input and output measurement data, as well as power,
+5 V DC and +12 V DC, for external devices (for example,
anemometer, auto pilot) . See Figure 5 for pinouts .
Figure 5 COM/DC Out Pinouts
Plumbing Diagram
The internal flow of gas through the analyzer is shown in
Figure 6 .
Figure 6 Plumbing Diagram
The gas enters the sample inlet (IN) and is initially filtered
through a 5 µm screen filter . It then enters the optional
pressure controller, which regulates the pressure to maintain
a specific setpoint . Before the gas travels through the optical
cell to the pump, it passes through an additional filter that is
greater than 95% efficient at removing particles that are 0.01
µm diameter or larger . The gas then passes through a second
5 µm screen filter before the pump as it exits through the
ventilation holes in the analyzer cover .
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